1996 Chevy Lumina

Chances are if the window will go down, the motor is good. My first guess would be the switch. Chances are it will be the main switch on the driver's side door. If you remove the door panel, check to see if there is power going to the motors when you pressure the switch. There will be two wires at the motor. Unplug the wiring and check to see if there is power. NOTE: the difference between the window going up or down is simply changing the polarity of the power. Thus, when going down, one wire will have power, when going up, the other will.

Let me know what you find.